<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
     <div>
      <img src="../assets/heima.png" />
      <span>电商后台管理系统</span>
     </div>
     <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
       <div class="toggle-button" @click="toggleCollapse">|||</div>
       <!-- 侧边栏菜单区域-->
       <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
        <!-- 一级菜单-->
        <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
         <!-- 一级菜单的模板区域-->
         <template slot="title">
          <!-- 图标-->
          <i :class="iconsObj[item.id]"></i>
          <!-- 文本-->
          <span>{{item.authName}}</span>
         </template>
         <!-- 二级菜单-->
         <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
          <template slot="title">
          <!-- 图标-->
          <i class="el-icon-menu"></i>
          <!-- 文本-->
          <span>{{subItem.authName}}</span>
         </template>
         </el-menu-item>
        </el-submenu>
       </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
       <!-- 路由占位符-->
       <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      // console.log(res)
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped="scoped">
.home-container {
  height: 100%;
}

.el-header{
 background-color: #373D41;
 display: flex;
 justify-content: space-between;
 padding-left: 0;
 align-items: center;
 color: #fff;
 font-size: 20px;
 > div {
   display: flex;
   align-items: center;
   span {
    margin-left: 15px;
  }
 }
}

.el-aside{
 background-color: #333744;
 .el-menu{
  border-right: none;
 }
}

.el-main{
 background-color: #eaedf1;
}

.iconfont{
 margin-right: 10px;
}

.toggle-button{
 background-color: #4A5064;
 font-size: 10px;
 line-height: 24px;
 color: #fff;
 text-align: center;
 letter-spacing: 0.2em;
 cursor: pointer;
}
</style>
